What is Synthesis? (3)
FM Synthesis (con’t)
The function of Amplifier is to control the volume of sound, but it is not always used for the control of volume. Two variables of volume are time and size. You can adjust the amount of volume differently over time and Envelop is doing this function. Amplitude is given detailed instructions from EG (Envelope Generator).
All synthesizers have at least one EG. FM synthesizers operate in a digital way, so EG also operates as a digital EG. Operator produces pure sine wave. Analog synthesizers generate sawtooth waves or square waves by the option of the oscillator, but FM-based oscillators generate only pure sign waves. This modulation of pure sine waves is made by an algorithm that is characteristic of FM method.
Operators are used in two types: Carrier and Modulator. Carrier becomes source of prototype of sound and modulator transforms carrier waves into various sounds. An application of combination of carriers and modulators is called ‘FM algorithm’. In FM algorithm, the combination between carriers is a typical form of Addictive Synthesis and the transformation of carrier waves through the modulator can be seen as an Amplitude Modulation.
The Yamaha DX7 is an FM-based synthesizer using six operators. When using algorithm 32, all six Operators can be used as carriers, so DX7 can works like typical Addictive Synthesizers. Create synthesis in DX7 with the following settings:
- Set the algorithm to 32
- Matches the tune of each operator differently
- The coarse setting changes the unit of the harmonics (the semitone unit)
- Fine tune makes a harmonic playing
- Adjust the balance by adjusting the volume of each operator
- Most of the basic waveforms (waveforms perceived as pitches) have the largest volume and the remaining harmonics (overtones) are relatively small volume
- Set appropriate EG and playing tools for the tone
If you implement the above setting, you will use Addictive Synthesis.
The advantage of FM Synthesis is that there are FM modulation using 32 algorithms.
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